<?xml version='1.0' encoding='iso-8859-1'?>
<!doctype html public '-//W3C//DTD XHTML 1.0 Strict//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'>
<html xmlns='http://www.w3c.org/1999/xhtml' lang='en-us'>
	<head>
		<title>
			hexencode.c
			</title>
		<meta http-equiv='content-type' content='text/html;iso-8859-1'/>
		<meta name='generator' content='motley-tools 1.9.4 13:40:33 Feb 18 2015'/>
		<meta name='author' content='cmaier@cmassoc.net'/>
		<meta name='robots' content='noindex,nofollow'/>
		<link href='toolkit.css' rel='stylesheet' type='text/css'/>
		</head>
	<body>
		<div class='headerlink'>
			[<a href='hexdump.c.html' title=' hexdump.c '>PREV</a>]
			[<a href='toolkit.html' title=' Index '>HOME</a>]
			[<a href='hexload.c.html' title=' hexload.c '>NEXT</a>]
			</div>
<pre>
/*====================================================================*
 *
 *   size_t hexencode (void * memory, size_t extent, char const * string);
 *
 *   memory.h
 *
 *   encode a hexadecimal string into a fixed length memory region;
 *   return the number of bytes encoded or 0 on error; an error will
 *   occur of the entire region cannot be encoded or the entire
 *   string cannot be converted due to illegal or excessive digits;
 *
 *   permit an optional HEX_EXTENDER character between successive
 *   octets; constant character HEX_EXTENDER is defined in number.h;
 *
 *   Motley Tools by Charles Maier &lt;cmaier@cmassoc.net&gt;;
 *   Copyright (c) 2001-2006 by Charles Maier Associates;
 *   Licensed under the Internet Software Consortium License;
 *
 *--------------------------------------------------------------------*/

#ifndef HEXENCODE_SOURCE
#define HEXENCODE_SOURCE

#include &lt;errno.h&gt;
#include &lt;ctype.h&gt;

#include &quot;../tools/memory.h&quot;
#include &quot;../tools/number.h&quot;

size_t hexencode (void * memory, register size_t extent, register char const * string)

{
	register byte * origin = (byte *)(memory);
	register byte * offset = (byte *)(memory);
	unsigned radix = RADIX_HEX;
	unsigned digit = 0;
	while ((extent) &amp;&amp; (*string))
	{
		unsigned field = HEX_DIGITS;
		unsigned value = 0;
		if ((offset &gt; origin) &amp;&amp; (*string == HEX_EXTENDER))
		{
			string++;
		}
		while (field--)
		{
			if ((digit = todigit (*string)) &lt; radix)
			{
				value *= radix;
				value += digit;
				string++;
				continue;
			}
			errno = EINVAL;
			return (0);
		}
		*offset = value;
		offset++;
		extent--;
	}

#if defined (WIN32)

	while (isspace (*string))
	{
		string++;
	}

#endif

	if ((extent) || (*string))
	{
		errno = EINVAL;
		return (0);
	}
	return (offset - origin);
}

#endif


</pre>
		<div class='footerlink'>
			[<a href='hexdump.c.html' title=' hexdump.c '>PREV</a>]
			[<a href='toolkit.html' title=' Index '>HOME</a>]
			[<a href='hexload.c.html' title=' hexload.c '>NEXT</a>]
			</div>
		</body>
	</html>
